SCIENTIFIC BOOKS 
H. K. LEWIS & CO. Ltd. 
A very large selection 
of new and standard works 
in every branch of Science 
always available. 
The Department for Scientific 
Books, English and Foreign, is on 
the first floor. (Passenger Lift.) 
Orders and Inquiries by Post 
promptly attended to. 
Underground: Euston Square, Warren 
Corner of Gower Street and Gower Street. ’Buses: Euston Road and 
Place adjoining University College. Tottenham Court Road. 
MEDICAL AND SCIENTIFIC $ Awnnvat Susscription, 
TOWN OR COUNTRY, 
LENDING LIBRARY FROM ONE GUINEA. 
Full Prospectus on Application. 
Books may be retained as long as required or exchanged daily. 
The Library is useful to Societies and Institutions, and to those engaged on 
Special Research Work, etc. The Library includes all Recent and Standard 
Works in all branches of Medical and General Science. Every work is the 
latest edition. 
Reading and Writing Room (First Floor) open daily. 
New Books and New Editions are added to the Library and are available to 
Subscribers Immediately on Publication. 
Catalogue of the Library, revised to December, 1927, with Supplements, 1928-30, 
and 1931-3, containing Classified Index of Subjects and Authors, demy 8vo., 
16s. net (to Subscribers, 8s.). The Supplements separately, 2s. net each 
(to Subscribers, ls. each). 
Bi-Monthly List of New Books and New Editions is issued free to all Subscribers 
and Bookbuyers regularly. 
H. K. LEWIS & CO. Ltd. 
PUBLISHERS AND BOOKSELLERS 
STATIONERY DEPARTMENT : Scientific and General. Loose-leaf 
Notebooks, Record Cards, Filing Cabinets, etc. 
SECOND-HAND BOOKS: 140 Gower Street. Large and varied stock. 
Books wanted advertised for and reported. (Telephone: Museum 4031) 
136 GOWER STREET, LONDON, W.C.1 
Telegrams : ‘PUBLICAVIT, WESTCENT, LONDON.’ Telephone : MUSEUM 7756 (3 lines). 
